System and method for providing positive and negative voltages from a single inductor
First Claim
Patent Images
1. A display device comprising:
- a plurality of display elements;
a driver circuit configured to drive the display elements at a plurality of voltages; and
a power supply configured to provide the plurality of voltages, the power supply comprising;
an inductor having a first end coupled via a source switch to a voltage source and coupled via a first plurality of output switches to a respective plurality of negative outputs and a second end coupled via a ground switch to a ground potential and coupled via a second plurality of output switches to a respective plurality of positive outputs; and
a controller adapted to configure the switches into at least;
a first configuration in which the source switch is closed, each of the first plurality of output switches is open, the ground switch is closed, and each of the second plurality of output switches is open,a second configuration in which the source switch is closed, each of the first plurality of output switches is open, the ground switch is open, and one of the second plurality of output switches is closed, anda third configuration in which the source switch is open, one of the first plurality of output switches is closed, the ground switch is closed, and each of the second plurality of output switches is open.
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Abstract
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for providing positive and negative voltages of a power supply. In one aspect, the power supply includes an inductor having a first end coupled via a source switch to a voltage source and coupled via a first plurality of output switches to a respective plurality of negative outputs and a second end coupled via a ground switch to a ground potential and coupled via a second plurality of output switches to a respective plurality of positive outputs and a controller adapted to configure the switches into at least one of multiple configurations.
21 Citations
28 Claims
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1. A display device comprising:
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a plurality of display elements; a driver circuit configured to drive the display elements at a plurality of voltages; and a power supply configured to provide the plurality of voltages, the power supply comprising; an inductor having a first end coupled via a source switch to a voltage source and coupled via a first plurality of output switches to a respective plurality of negative outputs and a second end coupled via a ground switch to a ground potential and coupled via a second plurality of output switches to a respective plurality of positive outputs; and a controller adapted to configure the switches into at least; a first configuration in which the source switch is closed, each of the first plurality of output switches is open, the ground switch is closed, and each of the second plurality of output switches is open, a second configuration in which the source switch is closed, each of the first plurality of output switches is open, the ground switch is open, and one of the second plurality of output switches is closed, and a third configuration in which the source switch is open, one of the first plurality of output switches is closed, the ground switch is closed, and each of the second plurality of output switches is open. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of providing negative and positive outputs of a power supply, the method comprising:
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connecting a first end of an inductor to a voltage source and a second end of the inductor to a ground voltage for a period of time sufficient to cause a current to flow through the inductor; performing at least one of the following until the current flowing through the inductor drops substantially to zero; disconnecting the first end of the inductor from the voltage source and sequentially connecting the first end of the inductor to two or more negative outputs to cause the current flowing through the inductor to flow from at least two of the two or more negative outputs; disconnecting the second end of the inductor from the ground potential and sequentially connecting the second end of the inductor to two or more positive outputs to cause the current flowing through the inductor to flow to at least two of the two or more positive outputs; and disconnecting the first end of the inductor from the voltage source, disconnecting the second end of the inductor from the ground potential, connecting the first end of the inductor to one of the two or more negative outputs, and connecting the second end of the inductor to one of the two or more positive outputs. - View Dependent Claims (10, 11, 12, 13)
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14. An apparatus for providing negative and positive outputs of a power supply, the apparatus comprising:
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means for connecting a first end of an inductor to a voltage source and a second end of the inductor to a ground voltage for a period of time sufficient to cause a current to flow through the inductor; means for performing at least one of the following until the current flowing through the inductor drops substantially to zero; disconnecting the first end of the inductor from the voltage source and sequentially connecting the first end of the inductor to two or more negative outputs to cause the current flowing through the inductor to flow from at least two of the two or more negative outputs; disconnecting the second end of the inductor from the ground potential and sequentially connecting the second end of the inductor to two or more positive outputs to cause the current flowing through the inductor to flow to at least two of the two or more positive outputs; and disconnecting the first end of the inductor from the voltage source, disconnecting the second end of the inductor from the ground potential, connecting the first end of the inductor to one of the two or more negative outputs, and connecting the second end of the inductor to one of the two or more positive outputs. - View Dependent Claims (15, 16, 17, 18)
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19. A method of providing negative or positive outputs of a power supply, the method comprising:
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connecting a first end of an inductor to a voltage source and a second end of the inductor to a ground voltage for a period of time sufficient to cause a current to flow through the inductor; disconnecting the first end of the inductor from the voltage source and sequentially connecting the first end of the inductor to two or more negative outputs to cause the current flowing through the inductor to flow from at least two of the two or more negative outputs; disconnecting the second end of the inductor from the ground potential and sequentially connecting the second end of the inductor to two or more positive outputs to cause the current flowing through the inductor to flow to at least two of the two or more positive outputs; and disconnecting the first end of the inductor from the voltage source, disconnecting the second end of the inductor from the ground potential, connecting the first end of the inductor to one of the two or more negative outputs, and connecting the second end of the inductor to one of the two or more positive outputs. - View Dependent Claims (20, 21, 22, 23)
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24. An apparatus for providing negative or positive outputs of a power supply, the apparatus comprising:
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means for connecting a first end of an inductor to a voltage source and a second end of the inductor to a ground voltage for a period of time sufficient to cause a current to flow through the inductor; means for disconnecting the first end of the inductor from the voltage source and sequentially connecting the first end of the inductor to two or more negative outputs to cause the current flowing through the inductor to flow from at least two of the two or more negative outputs; means for disconnecting the second end of the inductor from the ground potential and sequentially connecting the second end of the inductor to two or more positive outputs to cause the current flowing through the inductor to flow to at least two of the two or more positive outputs; and means for disconnecting the first end of the inductor from the voltage source, disconnecting the second end of the inductor from the ground potential, connecting the first end of the inductor to one of the two or more negative outputs, and connecting the second end of the inductor to one of the two or more positive outputs. - View Dependent Claims (25, 26, 27, 28)
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Specification